Norwest: Surface and Groundwater Hydrology


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Surface and Groundwater Hydrology Our Services Geology Engineering Field Services Water Resources Surface and Groundwater Hydrology Water Control and Management Water Permitting and Compliance Environmental Assessment & Remediation Environmental Management Consulting	Home > Our Services > Water Resources > Surface and Groundwater Hydrology Surface And Groundwater Hydrology Surface and groundwater supply and quality issues can be complex and are surrounded by a variety of compliance regulations. Using our experience and technology, Norwest’s hydrology experts assess your situation and create a cost-effective, efficient strategic plan to address these challenges. Norwest uses analytical and numerical modeling to evaluate surface and groundwater flow and quality. Using these techniques, Norwest professionals are able to analyze existing hydrogeologic conditions, and predict impacts of engineered interventions such as dewatering yield and drawdown. Modeling can be used for urban and rural stormwater runoff and water quality sampling. Our services include: Hydrology & Water Quality Site Characterization Surface Water Resources Evaluation Baseline Monitoring Plans and Data Collection Due Diligence Evaluations Floodplain Evaluations Stormwater Management Plans Permitting Support for Point Source Discharge Water Quality Planning & TMDL Issues Water Quality Modeling Stormwater Modeling Sediment Transport Modeling Erosion and Sediment Control Planning and Engineering Landowner Dispute Evaluation Compliance Monitoring Engineering Site Investigations Stream Bank Stabilization Slope Stability Reservoir Design, Certification, and Construction Oversight Impoundment Closure and Reclamation Road, Ditch, Culvert Design and Construction Oversight Weir & Flume Design Reclamation Plans and Certification SPCC Certification Water Treatment Design/Implementation/Monitoring Mining Field Evaluations and Pilot Testing Dewatering Projections and Designs Probable Hydrologic Consequences Evaluations Alluvial Valley Floor Investigations Design of Diversions &Post Mining Topography Reclamation Water Rights Water Rights Tabulations Stream Depletion Modeling Augmentation Plans Reservoir Storage Applications to State Agencies and MSHA Enlargement Petitions Hydrogeology Water Supply Well Design and Drilling Oversight Aquifer Testing, including Pumping Tests, Interference Tests, and Slug Tests Permeability Testing (Injection Falloff Testing – IFOT) Aquifer Classification Evaluations Injection Well Design and Permitting	Case Study Reclamation Plan, Washington State Situation: Norwest has been developing reclamation and closure designs for mine pits, overburden dumps and coal refuse impoundments at a coal mine in Washington State. Mining was discontinued at one of the mine pits due to geotechnical concerns following a pit side-wall failure in November 2006. As a result of cessation of mining operations in the pit, it was necessary to develop a new reclamation plan for this mine pit. Backfilling of the pit was not a viable option. The plan needed to address geotechnical and hydrologic stability and acid mine drainage concerns raised by the regulatory agencies as well as demonstrate that the proposed pit lake would be ecologically viable and meet the water quality requirements for both the pit lake and receiving stream. Solution: Norwest developed a reclamation plan for this pit that provided hydrologic and geotechnical stability and ensured adequate blending of isolated pockets of potentially acid-forming material with alkaline spoils to mitigate AMD and meet post-mining water quality criteria for mine drainage. A principal feature of the reclamation plan was the establishment of a permanent pit lake with a surface area of approximately 217 acres. Result: Norwest developed the detailed permitting and design plans within schedule and budget. Approvals were obtained from State and Federal agencies so that implementation of the plan could proceed according to schedule. The elements of the plan address all aspects of permit approval and regulatory requirements. Implementation of the Plan will allow the client to successfully meet the reclamation and post-mining water quality requirements.
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